Champion BioBird Clay Targets are made of natural materials to replace the petroleum-based binder of regular clay pigeons. These Champion clays are made with naturally occurring forestry products and limestone, so they wont acidify soil as they break down. Champion BioBird Clay Targets are ideal for shooting and target practice they fly true and break with exceptional smoke with a solid hit. Nonhazardous. 90-count.Made in USA. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Clay Targets.